[MATLAB] "dct2" function vs. [C language] "fftw_plan_r2r_2d" function

Hello there,

I'm trying to convert a C code to a MATLAB code.

Everything was going well but when I replaced the " fftw_plan_r2r_2d function" by the " dct2 MATLAB function". I didn't get the same result..

The discret cosine transform in C is defined as :

fftw_plan_r2r_2d((int)ny, (int)nx, data_fft, data_out, FFTW_REDFT01,FFTW_REDFT01, FFTW_ESTIMATE)

FFTW_REDFT01 stand for DCT-II ("The DCT")

Do you guys have any idea how can I get the same result as the C function ?

Kind Regards,